Metal injection molding product and carbon control method thereof in manufacturing process

Abstract

The invention relates to a metal injection molding product which contains material ingredients and a molding agent ingredient, wherein the material ingredients comprise 90-95 percent of iron powder, 2-5 percent of nickel powder and 0.5-1 percent of molybdenum powder; the molding agent ingredient contains paraffin wax, low density polyethylene, polypropylene, carnauba wax and stearic acid; and theadjustment range of the molding agent content is 6.0 percent to 8.0 percent. The carbon content range of a finally-sintered product can be effectively controlled by adopting the percentages and the contents of the materials, and therefore, the carbon content is controlled easily and accurately. In addition, the molding agent has the advantages of easy removal, environment protection, good fluidityand shaping effect, and the like, therefore, the quenched product has even and uniform internal and external hardness, and the processed product is ensured not to deform easily; and due to appropriate temperature, push speed and gas flow adopted on a thermal adsorption process as well as skilled drive to the ambient humidity, the stability of the process sand and the carbon content can be ensured, and the product with optimal performance is prepared.

Description

【Technical field】 [0001] The invention relates to a molding method of metal powder, in particular to a metal injection molding product used to control the carbon content in powder metallurgy products and a carbon control method for making the same. 【Background technique】 [0002] In the field of existing metal injection molding products, controlling the carbon content in the product is an eternal topic. On the basis of not adding other compounds, only by strictly controlling the carbon content can the final physical and mechanical properties be obtained. In order to obtain the final physical and mechanical properties, there are two basic solutions in the current production process. The first is the subsequent heat treatment after sintering, that is, carburizing and quenching; the second is the integrated process of degreasing and sintering. However, the iron-based product obtained after the heat treatment of the first method has a surface Rockwell hardness, and only one laye...

AI Technical Summary

Problems solved by technology

However, after the heat treatment of the first method, the iron-based product is obtained, and its hardness is the surface Rockwell hardness. Only one layer of carburized layer on the surface can meet the specified hardness requirements, and its internal Rockwell hardness value is very low.

The product obtained after the second processing method has poor stability, is difficult to control, has a large amount of deformation and a low pass rate

In the second processing method, the atmosphere generated by the degreasing in the furnace has a great influence on the sintering of the product, which will eventually lead to problems such as product deformation and melting